Hi, we use reason for + noun phrase, not reason of. For example: What’s the reason for the delay? We’ve been waiting more than an hour. Not: What is the reason of the delay? However, you may come across a formal expression "for reasons of...". e.g.: The government claims the new law is necessary for reasons of national security.

Hi I'm sorry. I thought you were asking what something labeled as "xxx" on it means. Which is something pornographic, alcohol, or poison... All are old fashioned labeling from 20th century. I misinterpreted the question, my bad.

Hey Jackie! I think it’ll be easier like this: The word “of” is used to talk about a specific person or thing. Such as “the reasons of Tim.” In that case we might use “for” to refer to a specific set of actions probably. Such as “the reason for going to the mall.” I’m unsure of most of the contexts though I hope I clarified some of these things for you!

It will always be reasons for. You can say causes for and cause of, but for "reason(s)" it will always be for.

The correct way to put it is the reasons for ,instead of reason of .